Samsung Electronics Co. is in the spotlight about its labor practices in China.

New York-based non-profit organization China Labor Watch said in a report on Dec. 14 that its investigations found that HTNS Shenzhen Co. Ltd., a company that assembles mobile phones for Samsung in China, allegedly employed girls under the age of 16.

Samsung swiftly denied the allegations in a statement, saying that there are no underage workers employed at its supplier, HTNS Shenzhen Co. A representative at HTNS Shenzhen declined to comment.

“As part of our pledge against underage employment, we began auditing all sites in China in September, and are implementing new hiring policies to strengthen identity verification measures. These include in-person interviews of all candidates, the introduction of electronic devices to detect fake IDs, and enhanced training and guidelines for managers and HR personnel,” Samsung said.

This isn’t the first time Samsung has come under the scrutiny of China Labor Watch. In September, China Labor Watch said it found evidence of offenses including excessive overtime, exhausting working conditions and the use of underage workers after checking conditions at six factories operated directly by Samsung and two operated by suppliers between May and August.

Responding to the allegations, Samsung said in November it was taking corrective measures. While denying the child labor allegations, Samsung said it had identified instances of employees working overtime hours in excess of local regulations.

“The audit identified several instances of inadequate practices at the facilities, including overtime hours in excess of local regulations, management of supplier companies holding copies of labor contracts, and the imposition of a system of fines for lateness or absences,” it said at the time.